EP 0814172 B1 20020911 - Powder metallurgy hot-work tool steel, and process for its manufacture
Title (en)
Powder metallurgy hot-work tool steel, and process for its manufacture
Title (de)
PM-Warmarbeitsstahl und Verfahren zu dessen Herstellung
Title (fr)
Acier à outils pour travail à chaud, obtenu par métallurgie des poudres et procédé pour sa fabrication
Publication
Application
Priority
EP 96109706 A 19960617
Abstract (en)
[origin: EP0814172A1] A powder metallurgically produced hot work steel has the composition (by wt.) 0.25-0.45% C, 2.40-4.25% Cr, 2.50-4.40% Mo, 0.20-0.95% V, 2.10-3.90% Co, 0.10-0.80% Si, 0.15-0.65% Mn, balance Fe and impurities. Preferably, the steel has a purity K1 of less than 10 mu m. Also claimed is powder metallurgical production of the above hot work steel by (a) atomising a steel melt of the above composition in a high purity nitrogen atmosphere; (b) filling the resulting powder into capsules designed such that the final product achieves its intended shape with maximum material yield; (c) shaking the filled capsules to achieve maximum filling density; (d) evacuating and then gas-tightly sealing the capsules; and (e) hot isostatically pressing the capsules at 1000-1230 degrees C and 0.8-3.5 (preferably 1) kbar pressure for ≥ 3 hrs.
IPC 1-7
IPC 8 full level
B22F 3/14 (2006.01); B22F 3/15 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C22C 38/30 (2006.01)
CPC (source: EP KR US)
B22F 3/004 (2013.01 - EP US); B22F 3/1258 (2013.01 - EP US); B22F 3/20 (2013.01 - KR); B22F 9/082 (2013.01 - EP US); C22C 33/0264 (2013.01 - EP US); B22F 2201/02 (2013.01 - EP US); B22F 2201/20 (2013.01 - EP US); B22F 2202/01 (2013.01 - EP US); B22F 2998/10 (2013.01 - EP US); B22F 2999/00 (2013.01 - EP US)
C-Set (source: EP US)
Citation (examination)
ASM Specialty Handbook, Tool Materials, 1995, J.R. Davis, 144-146
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0814172 A1 19971229; EP 0814172 B1 20020911; AT E223975 T1 20020915; DE 59609657 D1 20021017; DK 0814172 T3 20021118; ES 2181827 T3 20030301; JP 3456707 B2 20031014; JP H10510884 A 19981020; KR 100270453 B1 20001201; KR 19990036411 A 19990525; PT 814172 E 20030131; US 6015446 A 20000118; WO 9748829 A1 19971224
DOCDB simple family (application)
EP 96109706 A 19960617; AT 96109706 T 19960617; DE 59609657 T 19960617; DK 96109706 T 19960617; EP 9703119 W 19970616; ES 96109706 T 19960617; JP 50223698 A 19970616; KR 19980701080 A 19980213; PT 96109706 T 19960617; US 1179298 A 19980416